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NTTED STATES PATENT OFFICE@u HARRY IV. BOLENS, OF PORT WASHINGTON,WISCONSIN, ASSIGNOR TO THE GILSON MANUFACTURING COMPANY, OF SAME PLACE.

CHAIR.

SPECIFICATION forming part of Letters Patent No. 535,347, dated March12, 1895.

Application ld November 20, 1893. Serial No. 491,374. (No model.)

T all whom it may concern: the operatorwhen said spindle is to be run upBe it known that I, HARRY W. BOLENS, a or down. citizen of the UnitedStates, and a resident of To positively maintain the spindle in its PortWashington, in the county of Ozaukee, vertical adjustment a clamp ofsome descrip- 5 and in the State ofWisconsin, have invented tion isnecessary, and while various devices certain newand useful Improvementsin of this character may be found suitable for Chairs; and I do herebydeclare that the folthe purpose, I prefer the one herein shown, lowingis a full, clear, and exact description the same consisting of a metalblock D havthereof. ing a threaded concave surface in mesh with 5c io Myinvention has for its object to provide the spindle C,and a screw Ehaving a nona chair of that class having pivotal seats adthreadedextremity d in loose upset engagejustable to various elevations at will;and it ment with the block, this screw being arconsists in certainpeculiarities of construcranged to work in a threaded bearingF formedtion and combination of parts, whereby a with or held on the castingAabove specified. i5 chair-seat inayhave free rotation While in lock Theseat-iron Gis provided with la dependagainst movement in a verticaldirection or ing pivot I'I that loosely engages the socket be heldagainst independent rotary motion in the spindle C, and as herein shownthe while being raised orlowered, and by the same pivot has a laterallug e that enters the chammeans said seat may be kept from both roberedportion h of said socket through a ver- 7o zo` tary and verticalmovement, my improved tical ehannelfand serves asastop to prevent meansfor accomplishing the above enumerunpremeditated disengagement of saidseatated results being hereinafter specifically set iron and spindle.Inasmuch as the luge and forth with reference to the accompanyingchannelj'1 may be in register at any time or drawings and subsequentlyclaimed. come into register when the chair is lifted,it z5 In thedrawings: Figure l represents a veris desirable that some means beemployed to tical transverse section of a portion of a chair close theentrance-channel to the chamber in embodying my improvements, and Figs.2 and the spindle, and as one way of accomplishing 3, horizontalsections respectively taken on this result I show a spring stop Iarranged in lines 2 2 and 3-3 of the preceding figure. a recess portionof the spindle-head and pro- 8o 3o Referring by letter to the drawings Arepvided with a linger g by whichit may be reresents a casting having ascrew-threaded tracted whenever necessary or desirable. bore andexterior sockets, these sockets be- To lock the seat-iron pivot I-Iagainst rotaing for the reception of the upper ends of legs tion Imayemployaset-screwJherein shown as B, the latter and said castingconstituting havingits bearinginthespindle-head. While 35 what isgenerally termed a chair-base. Enthe screw J is sufficient as a meansfor lock- `gaging the bore of the casting is a screw-spining theseat-iron pivot to the spindle, various dle C that differs from those ofordinary conother means may be employed for the same struction in so farthat its upper portion is purposewithoutdeparturefrommyinvention.recessed for aconvenient distance in a verti- Owing to the fact that thespindle is gen- 9o 4o cal direction to form a socket, and, as hereinerally made of steel and the seat-iron pivot shown, I may increase thediameter of this of cast-iron there will be more or less wear socket ata certain point intermediate of its between the two. 'IhereforeI makethe chamextremities to thereby provide an annular ber l) in said spindleof sufficient depth to perchamber b, the latter being of any desirablemit of a considerable descent of the pivot-lug 45 depth. In order tocompensate for loss of e, and said chamber is also intended as a remetal incidental to the formation of the chainceptacle for a supply oflubricant. ber, above specified, the adjacent portion of To vary theelevation of the spindle, the the spindle may be enlarged to form anonclamp is loosened and said spindle revolved, threaded head c of anydimensions or design either by its head or by turning the chairroc 5ofound most convenient or desirable, and such seat, provided the latterbe in lock with the a head will be found useful as a hand-grip foraforesaid spindle. The spindle having been adj usted to the desiredelevation and clamped,

- the seat-iron pivot will be ordinarily left free to turn in its socketso that the occupant of the chair may swing about Without causingmovement of said spindle up or down, but it is obvious that thechair-seat may be held against both rotary and vertical movement by theproper adjustment of the locking devices above specied.

From the foregoing it will be seen that the spindle has the same rangeof vertical adjustment as those of the most ordinary construction andthere is no possibility of lubricant dropping down on the surface uponwhich the chair-base sets.

Another advantage of my chair consists in the fact that it can beshipped in a knockdoWn condition and no tool or skilled mechanic arenecessary to properly assemble said chair, lthis being a matter ofconsiderable importance to the trade.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The combination of a chair base, a spindle connected to the base andrecessed at its upper portion to form a vertical socket, an annularchamber communicating with the socket and a vertical entrance channel tothe chamber; a seat-iron havinga depending pivot that engages saidsocket, a lateral lug on the pivot let into said chamber through saidchannel, and a suitable device arranged in the spindle to close theaforesaid channel against Withdrawal of the pivot-lug from the aforesaidchamber, substantially as setforth.

2. Thecombiuationof a chair-base, a spindle vertically adjustable in thebase and recessed at its upper end to form a vertical socket, an annularchamber communicating with the socket and a vertical entrance channel tothe chamber; suitable means for locking the spindle in adjustedposition, a seatiron having a depending pivot that engages said socket,a lateral lug on the pivot let into said chamber through said channel,and a suitable device arranged in the spindle to close the aforesaidchannel against Withdrawal of the pivot-lug from the aforesaid chamber,substantially as set forth.

8. The combination of a chair-base, a spindle connected to the base andrecessed at its upper portion to form a vertical socket, a chambercommunicating with the socket and a vertical entrance channel to thechamber; a seat-iron having a depending pivot that engages said socket,a lateral lug on the pivot let into said chamber through. said channel,a suitable device arranged in the spindle to close the aforesaid channelagainst Withdrawal of the pivot-lug from the aforesaid chamber, and aset-screw in said spindle opposed to said pivot, substantially as setforth.

In testimony that I claim the foregoing I have hereunto set my hand, atPort Washington, in the county of Ozaukee and State of Visconsin, in thepresence of two Witnesses.

H. W. BOLENS.

Vitnesses:

WM. AHLHAUSER, .Tor-IN GILsoN.

